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CICS DELETE CONTAINER (CHANNEL) - Channel Container Deletion

CICS DELETE CONTAINER (CHANNEL) provides channel container deletion capabilities in CICS environments. It enables programs to delete containers from channels, manage container cleanup, and handle container deletion in CICS applications.

What is CICS DELETE CONTAINER (CHANNEL)?

CICS DELETE CONTAINER (CHANNEL) is a command that allows programs to delete containers from channels, manage container cleanup, and handle container deletion in CICS environments. It provides container deletion capabilities, cleanup management, and deletion handling for CICS applications.

Command Syntax

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EXEC CICS DELETE CONTAINER
    [CHANNEL(channel-name)]
    [CONTAINER(container-name)]
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

  • CHANNEL - Channel name containing the container
  • CONTAINER - Container name to delete

Optional Parameters

  • RESP - Response code variable

Container Deletion Types

Single Container Deletion

Delete individual containers from channels

  • • CONTAINER DELETE - Delete specific containers from channels
  • • CONTAINER REMOVAL - Remove containers from channel structure
  • • CONTAINER CLEANUP - Clean up container resources and free memory
  • • CONTAINER DESTRUCTION - Destroy container data and release resources

Multiple Container Deletion

Delete multiple containers from channels

  • • BATCH DELETE - Delete multiple containers in single operation
  • • GROUP DELETE - Delete containers belonging to specific groups
  • • PATTERN DELETE - Delete containers matching specific patterns
  • • BULK DELETE - Delete large numbers of containers efficiently

Conditional Deletion

Delete containers based on conditions

  • • CONDITIONAL DELETE - Delete containers based on specific conditions
  • • FILTERED DELETE - Delete containers matching filter criteria
  • • CRITERIA DELETE - Delete containers based on defined criteria
  • • RULE DELETE - Delete containers based on business rules

Selective Deletion

Delete containers selectively

  • • SELECTIVE DELETE - Delete containers based on selection criteria
  • • TARGETED DELETE - Delete specific target containers
  • • PRIORITY DELETE - Delete containers based on priority levels
  • • CATEGORY DELETE - Delete containers by category or type

Programming Examples

Basic Container Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETECON01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  CHANNEL-NAME     PIC X(16) VALUE 'MAIN-CHANNEL'.
       01  CONTAINER-NAME   PIC X(16) VALUE 'DATA-CONTAINER'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE CONTAINER
               CHANNEL(CHANNEL-NAME)
               CONTAINER(CONTAINER-NAME)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Container deleted successfully'
               DISPLAY 'Channel Name: ' CHANNEL-NAME
               DISPLAY 'Container Name: ' CONTAINER-NAME
           ELSE
               DISPLAY 'Failed to delete container'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Multiple Container Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETECON02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  CHANNEL-NAME     PIC X(16) VALUE 'DATA-CHANNEL'.
       01  CONTAINER-NAME   PIC X(16) VALUE 'TEMP-CONTAINER'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       01  DELETE-COUNT    PIC 9(3) VALUE 0.
       01  CONTAINER-LIST.
           05  CONTAINER-ITEM OCCURS 5 TIMES.
               10  CONTAINER-ID PIC X(16).
       
       PROCEDURE DIVISION.
           MOVE 'CONTAINER-01' TO CONTAINER-ID(1)
           MOVE 'CONTAINER-02' TO CONTAINER-ID(2)
           MOVE 'CONTAINER-03' TO CONTAINER-ID(3)
           MOVE 'CONTAINER-04' TO CONTAINER-ID(4)
           MOVE 'CONTAINER-05' TO CONTAINER-ID(5)
           
           PERFORM VARYING DELETE-COUNT FROM 1 BY 1
               UNTIL DELETE-COUNT > 5
               
               EXEC CICS DELETE CONTAINER
                   CHANNEL(CHANNEL-NAME)
                   CONTAINER(CONTAINER-ID(DELETE-COUNT))
                   RESP(RESPONSE-CODE)
               END-EXEC
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   DISPLAY 'Container ' CONTAINER-ID(DELETE-COUNT) ' deleted successfully'
               ELSE
                   DISPLAY 'Failed to delete container ' CONTAINER-ID(DELETE-COUNT)
               END-IF
           END-PERFORM
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Container Deletion

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DELETECON03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  CHANNEL-NAME     PIC X(16) VALUE 'TEST-CHANNEL'.
       01  CONTAINER-NAME   PIC X(16) VALUE 'TEST-CONTAINER'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DELETE CONTAINER
               CHANNEL(CHANNEL-NAME)
               CONTAINER(CONTAINER-NAME)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Container deletion successful'
                   DISPLAY 'Channel Name: ' CHANNEL-NAME
                   DISPLAY 'Container Name: ' CONTAINER-NAME
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid deletion request'
               WHEN DFHRESP(CHANNELERR)
                   DISPLAY 'Channel-specific error occurred'
               WHEN DFHRESP(CONTAINERERR)
                   DISPLAY 'Container-specific error occurred'
               WHEN DFHRESP(AUTHORITYERR)
                   DISPLAY 'Authorization error occurred'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Container Deletion Management

Resource Management

  • • Resource Cleanup - Clean up container resources and free allocated memory
  • • Resource Deallocation - Deallocate resources used by containers
  • • Resource Monitoring - Monitor resource usage during deletion
  • • Resource Optimization - Optimize resource usage for deletion operations

Data Management

  • • Data Cleanup - Clean up container data and remove references
  • • Data Validation - Validate data integrity before deletion
  • • Data Backup - Backup data before deletion if required
  • • Data Recovery - Recover data if deletion fails

Operation Management

  • • Operation Tracking - Track deletion operations and their status
  • • Operation Validation - Validate deletion operations and ensure correctness
  • • Operation Recovery - Recover from failed deletion operations
  • • Operation Monitoring - Monitor deletion operations and performance

Error Management

  • • Error Detection - Detect errors during deletion operations
  • • Error Recovery - Recover from deletion operation errors
  • • Error Reporting - Report deletion operation errors
  • • Error Prevention - Prevent future deletion operation errors

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Container deleted successfully
  • DFHRESP(INVREQ) - Invalid deletion request
  • DFHRESP(CHANNELERR) - Channel-specific error
  • DFHRESP(CONTAINERERR) - Container-specific error
  • DFHRESP(AUTHORITYERR) - Authorization error
  • DFHRESP(RESOURCEERR) - Resource error

Performance Considerations

Deletion Efficiency

  • • Optimize deletion operations - Use appropriate deletion methods for different container types
  • • Minimize deletion overhead - Reduce the computational cost of deletion operations
  • • Use efficient deletion patterns - Implement deletion strategies that minimize resource usage
  • • Monitor deletion performance - Track the performance impact of deletion operations

Resource Impact

  • • Monitor resource usage - Track how deletion operations consume system resources
  • • Optimize resource allocation - Ensure efficient allocation of resources for deletion
  • • Manage resource cleanup - Properly clean up resources after deletion operations
  • • Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Container Deletion Best Practices

  • • Always check response codes
  • • Use appropriate deletion parameters
  • • Implement proper error handling
  • • Ensure proper resource cleanup
  • • Validate deletion operations
  • • Optimize deletion operations
  • • Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS DELETE CONTAINER (CHANNEL) like removing items from a box:

  • • Box Name: "Which box to look in" - The channel name
  • • Item Name: "Which item to remove" - The container name
  • • Remove Item: "Take item out of box" - Delete container
  • • Item Gone: "Item is no longer in box" - Container deleted
  • • Clean Up: "Clean up the space" - Resource cleanup

Exercises

Exercise 1: Basic Container Deletion

Create a program that deletes containers from channels using DELETE CONTAINER.

Exercise 2: Multiple Container Deletion

Write a program that deletes multiple containers from channels in batch operations.

Exercise 3: Error Handling

Implement comprehensive error handling for container deletion failures.

Related Concepts

Container Management

Managing channel containers

Channel Management

Managing system channels

Resource Cleanup

Cleaning up system resources

Data Management

Managing container data

Error Handling

Managing deletion errors